JPS6124793A - Long distance drilling construction method of horizontal pit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a long-distance excavation method for a horizontal shaft that can easily construct a small-diameter horizontal shaft underground over a long distance in a substantially horizontal direction.

(Prior Art) There are currently various methods of using an excavator to horizontally construct a small-diameter horizontal shaft over a long distance, and FIG. 7 shows a common method. However, in this construction method, the excavator 13A excavates from the start-side shaft 9 toward the arrival-side shaft, and it is difficult to control the direction especially with a small-diameter excavator, and it is difficult to maintain horizontal straightness. The drawback is that it is difficult to excavate and the construction accuracy is poor.

Additionally, as shown in Japanese Patent Application Laid-open No. 11297/1983,
In order to improve construction accuracy, as shown in FIG. 8, horizontal boring is performed in advance via the horizontal rod 11 of the horizontal boring machine 3 to form a leading hole 12 for leading the boring machine.
A propulsion tube of a predetermined diameter is inserted while enlarging this guide hole 12 as a guide (there is also a method).

(Problem to be solved by the invention) However, this method also has problems during the initial horizontal boring.
The hole may go down as shown by the broken line due to gravity acting on the horizontal rod 11 of the horizontal boring machine 3 on the excavation tool, or go up due to the resistance of sludge that accumulates on the bottom surface, or due to soil conditions or obstacles such as excavation holes underground. Because of this, the tube would bend to the left or right, making it impossible to dig a straight hole to serve as a guide, and there would be many practical problems in enlarging the hole and inserting the tube.

(Means for Solving the Problems) The present invention has been proposed in view of the above points, and its purpose is to form a vertical bone ring hole from the ground on a line where a horizontal shaft is to be constructed; A guide pipe is installed in the borehole, and horizontal boring is performed in a substantially horizontal direction from the starting side shaft through the guide pipe, which can adjust the direction of excavation, to form a pilot hole. The purpose of this invention is to provide a long-distance excavation method for horizontal shafts in which the accuracy of long-distance horizontal boring is significantly improved by enlarging the hole, and the directionality of the excavator is therefore good.

(Structure of the invention) Hereinafter, the present invention will be explained along with the drawings.

1 to 3 show one embodiment of the present invention.

As shown in FIGS. 1 and 2, first, prior to horizontal boring performed to form a lead hole for a guide, appropriate intervals are set at the point where the horizontal boring is to be performed, that is, on the line where the horizontal shaft is to be constructed. Form at least one or more vertical boring holes 2 (first to nth) through a vertical boring machine 1 from the ground through the ground, and easily change the direction of excavation of a horizontal boring machine 3 that performs horizontal boring into the vertical boring holes 2. The first to nth guide pipes 4 that can be modified are installed. FIG. 3 shows the details of this guide pipe 4. The guide pipe 4 is provided with a vertical bit 5 at its tip.
It includes a guide pipe body 7 in which a rectangular guide hole 6 is formed, and a cylindrical vertical rod 8 whose lower end is connected to the upper end of the guide pipe body 7. As shown in FIGS. 1 and 2, the vertical boring machine 1 is connected to a vertical boring machine 1 of a well-known configuration, and as the guide pipe 4 is rotated and pushed downward by the vertical boring machine 1, a vertical pit 5 forms a vertical boring hole. 2 can be drilled, and when the hole 2 reaches a predetermined depth where it intersects with the horizontal borehole, if the guide pipe 4 is left in each vertical borehole 2, the guide pipe 4 will be automatically guided into the vertical borehole 2. Install pipe 4 (
be able to.

Next, using the horizontal boring machine 3, horizontal boring is performed from the starting side shaft 9 toward the destination side shaft 10, which has been built in advance in a predetermined direction. Since the vertical boring hole 2 and the guide pipe 4 are provided in this direction, the tip 1ia of the horizontal rod 11 of the horizontal boring machine 3 does not initially pass through the guide hole 6 of the first guide pipe 4. Become.

In this case, as shown by the broken line, if the horizontal rod 11 has fallen below the intended horizontal direction due to the influence of gravity, etc., it is only necessary to pull the guide pipe 4 upward and correct it to the horizontal position. . Also, on the contrary, horizontal rod 1
1 is on a higher course than planned, the guide pipe 4 may be pushed in to correct it to an appropriate position. Therefore, it is preferable to drill the vertical borehole 2 with some allowance.

Then, as the horizontal boring progresses, the horizontal rod 11, which is gradually extended, becomes the second. Each time the n-th guide pipe 4 is reached, horizontal boring is performed to the destination shaft 10 while operating the guide pipe 4 to correct the position of the horizontal rod 11 as necessary.

After that, while pulling out the horizontal rod 11 from the arrival side shaft 1o side, using the horizontal rod 11 and the pilot hole 12 obtained by horizontal boring as a guide, as shown in Fig. 4, from the starting side shaft 9 side. The cutter drive pipe 14 of the excavator 13 is inserted into the reaching side vertical shaft 10 while being successively added. At this time, when inserting the cutter drive pipe 14, the guide pipe 4 is pulled out from the vertical bore hole 2 (.

One end of the cutter driving pipe 14 is connected to the cutter 15 at the tip of the excavator 13 installed in the starting shaft 9, and the other end of the pipe 14 is connected to the cutter driving pipe 14 installed in the reaching shaft 10. Connected to motor device 16. This cutter drive motor device i16 is provided at the rear of the mine entrance wall 11 and includes a fixed pedestal 18 on which a driving pipe 14 is placed, a rotary table 19 and a Kelly bar 20 provided on the rear surface of this fixed pedestal 18. , a drive unit 21 for rotating the drive pipe 14, and the like.

Next, as shown in FIG. 5, the cutter drive motor device 16 is driven, and in this case, the cutter drive motor device 16 is driven, for example, via a Kelly bar 20 having a square cross section and a structure that can transmit rotational force but can freely slide left and right. The cutter drive pipe 14 is rotated to rotate the cutter 15 at the tip of the excavator 13 connected to one end thereof, and the propulsion jack 24 provided between the reaction force receiver 23 provided in the starting shaft 9 and the strut 22 A relatively small-diameter excavator 13 is installed in the starting side vertical shaft 9.
The pilot hole 12 is enlarged by digging until it reaches the reaching side vertical shaft 10 while pushing from the bottom.

A horizontal shaft can be constructed by sequentially adding segments 25 from the start-side shaft 9 as the excavator 13 advances; in this case, the reaching-side shaft 10 By sequentially disassembling and removing unit-length cutter drive pipes 14 on the side, it is possible to easily construct a substantially horizontal shaft in the ground. Note that the vertical borehole 2 may be filled with excavated earth and sand to close it. Moreover, according to this construction method, it is also possible to construct a curve with a relatively large curve radius. That is, a pilot hole 12 is drilled in a predetermined curve while correcting the direction of the horizontal rod 11 of the leading horizontal boring by the guide pipe 4,
A bendable joint (not shown) is provided in the guide hole 12.
Curve construction can be carried out by installing a drive pipe 14 per unit length through the excavator 13 and driving the excavator 13 to perform excavation.

The excavator 13 in the above is a so-called single-cutter type excavator, which is installed at the joint between the cutter 15 and the pipe 14 as necessary, and connected to a mud material injection pipe (not shown). It is preferable to inject mud material into the face from the mud material injection port 26 to turn the excavated soil into mud, and to perform excavation while pressing down the face with the earth pressure of the mud.

In addition, a swivel joint 27 connected to a mud material injection pipe is provided at the end of the Kelly bar 20 of the reaching side vertical shaft 100, and a swivel joint 27 is provided at the end of the Kelly bar 20 of the reaching side vertical shaft 100, and the Kelly bar 20 and the drive pipe 114 are made hollow, and the connecting part with the cutter 15 is made hollow. It is also possible to form a mud-making soil material injection port 26 similar to that described above, and to inject mud-making soil material from the reaching side vertical shaft 10 as required.

In addition, 28 and 29 in the figure are earth retaining shoring installed in each shaft 9 and 10, 30 is the entrance wall of the starting side shaft 9, and 31 is ii
! A screw conveyor for soil removal whose front end is connected to the lower part of the partition wall of the shield cylinder 32 that constitutes the advancing machine 13, and 33 is a slider for transferring the soil discharged from the screw conveyor 31 to the rear, using a pump or the like. It's okay.

FIG. 6 shows a second embodiment of the present invention, in which a guide pipe (
A guide hole 12 is formed in a predetermined direction through a guide hole 12 (see the above-mentioned embodiment), and a guide pipe and a horizontal rod are pulled out. Either or both of the side shafts 9 and 10 were filled with a highly viscous material (for example, high clay), and using the pilot hole 12 itself as a guide, it was installed protruding from the center of the cutter 15 of the excavator 13A. It is characterized in that a horizontal leading member 34 is disposed in the leading hole 12, and using these as a guide, the excavator 13A excavates from the starting side vertical shaft 9 to construct a horizontal shaft.

The cutter 15 of the excavator 13A in this embodiment is rotated by an internal drive motor 35, and also has a propulsion function. Namely, the shield! ! A propulsion jack 36 is provided between the bulkhead 32 and the front end of the segment 25 already assembled, and a propulsion jack 2 is also provided on the starting side shaft 9 side.
4 are provided, and the propeller moves forward by the thrust of these thrusters, and the other configurations are substantially the same as those of the previous embodiment.

In each of the above embodiments, a case where a mud pressurizing type excavator is used is explained, but depending on the ground or other conditions, a mud type excavator or other rotary cutter type mechanical excavator such as an earth pressure balance shield may be used. Of course, it is possible to apply

(Effect of the invention) As described above, according to the present invention, on the line where the horizontal shaft is constructed,
A vertical borehole is formed from the ground, a guide pipe is built in the vertical borehole, and a pilot hole is formed by horizontally boring in a substantially horizontal direction from the starting side shaft through the guide pipe whose excavation direction can be adjusted. However, since the pilot hole is expanded using a tunneling machine through this pilot hole, it is possible to reliably form a pilot hole in a substantially horizontal direction.
Therefore, there is an advantage that a substantially horizontal shaft having a predetermined diameter can be constructed over a long distance.

[Brief Description of the Drawings] Figures 1 to 3 show an embodiment of the present invention, and Figure 1 is an explanatory diagram showing a state where horizontal boring is being performed after a guide pipe has been installed in a vertical borehole; Figure 2 is a cross-sectional view taken along line A-A in Figure 1, Figure 3 (a) is a side view of the guide pipe, (b) is a front view of the same as above, and (c) is a cross-sectional view taken along line B-B in (b). Figures 4 and 5 are explanatory diagrams showing the state in which a pilot hole is expanded by an excavator, Figure 6 is another embodiment of the present invention, and Figures 7 and 8 are conventional examples, respectively. . 2... Vertical borehole, 4... Guide pipe, 9... Start side shaft, 10... Arrival side shaft, 1
2... Leading hole, 14... Drive pipe, 13,
13A... excavator, 15... cutter, 34...
...Leading member Figure 3

Claims (2)

[Claims] (1) A vertical borehole is formed from the ground on the line where the horizontal shaft is to be constructed, a guide pipe is built in this vertical borehole, and the direction of excavation can be adjusted from the starting side vertical shaft through the guide pipe. Excavation in which a pilot hole is formed by horizontal boring in the horizontal direction, a drive pipe that can be rotated through a drive means provided in the reaching side shaft is installed in the pilot hole, and this drive pipe is installed in the starting side shaft. A long-distance excavation method for a horizontal shaft, in which the horizontal shaft is connected to a cutter of an excavator that excavates a horizontal shaft of a small diameter, and the pilot hole is expanded through the cutter to construct a horizontal shaft underground. (2) A vertical borehole is formed from the ground on the line where the horizontal shaft is to be constructed, a guide pipe is built in this vertical borehole, and the direction of excavation can be adjusted from the starting side vertical shaft through the guide pipe. A pilot hole is formed by horizontal boring, the pilot hole is filled with a highly viscous material, and a pilot member protruding from the tip of a cutter of an excavator that can drill into the pilot hole is placed, and a pilot hole is inserted through them. A long-distance excavation method for horizontal shafts that involves expanding holes and constructing horizontal shafts underground.